Oil burner



P'. VV. TRIVIBORN AND F. J. BLUM.

OIL BURNER.

APPLICATION FILED JUNEao. 1919. RENEWED MAR'. 2,9. 1922,.

Patnted 001k. M. 1922;.

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rn'rnnw.. TRIMBORN AND FRANK J. BLUM, or MILWAUKEE, wisconsin, nssreNons'ro cnunn orL Gas sYs'rnMs coi/LrnNY, or MILWAUKEE, wrscoNsrN, .aconsonni trioN or wrsCoNsrN.

y oIL Bunnies.

y Application led .Tune 30, 1919,'Seria1 No. 307,565. Renewed March 29,1922. Serial No. 547,927.

To aiZZ w hom t may concern and FRANK J. BLUM, citizens of the United.States, residing at Milwaukee, county of 5 biilwaukee', and State ofl/v'isconsin, have invented new and useful Improvements in Oil Burners,of which the following `is a spec1- iication. i

@urinvention relates to improvements in oil burners ofthe general typedisclosed 1n former Letters Patent of the United States, No. 1,233,676,dated July 17th, 1917, granted to Ernest 0. Linton and Frank J; Blum.

The object of our invention is primarily to overcome difficultiesexperienced in the use of burners constructed as disclosed in saidformer patent, due to the carbonization in the fuel heating ducts, wehaving dis` f covered that such carbonization can be prevented byseparately heating the air and the liquid fuel, (heavy hydrocarbon), andallowing the air and vaporized. fuel to mix` at a nozzleoutlet,com1nunicat1ng directly with, or discharging into, the burner. Afurther object of our invention is to provide `a form of construction inwhich manu` facturing cost will be reduced to a minimum, with increasedeliciency and durability as compared with burner structures of this`type heretofore made.`

The drawing illustrates" our invention partly in vertical section, andpartlyin elevation, with parts" assembled in position 'for use. 4 y

Air under pressure is delivered through an inlet duct 1 to a heatingcoil 2 located within a 'cylindrical burner 3, the latter having air`.inlet apertures i at its rear end,l and the front end beingvopen forthe discharge of the burning gases. Y y

The front end of the heating coil is connected with an outlet duct 5,elbowed at 6 and connected with a pipe 7 extending rearwardly along thecylinder 3 and the air inlet pipe 1, preferably parallel, or substantiallyv parallel, thereto. Near its rear end, the pipe 7 is providedwith a valve at 8, and i beyond this valve itis connected suitable lelbows anda downwardly 'extendlng pipe 9, with an air nozzle duct 10,conveying air through the nozzle head 11, the lower `end of the duct 10providing an air passage through thehead ll of which it is a part.

Liquid fuel is delivered from a suitable `source of supply through apipe 14; into the Be it known that we, Pnirnn W. TRIMBORN front endportion of a cylinder 15 through winch the pipe 7 'passes longitudnally.The .internaldiameter of the cylinder l5 is larger than. the diameter`of `the pipe 7, thereby forming an annular' passage 16, along which.the liquid fuel may travel. to an outlet 17 near the rear end of thecylinder, this outlet being connected by pipe sections 20, 21 and 22with the nozzle head 11, from which the fuel is discharged into the pathof the air blast from the lower end of duct 10. The lower end of theduct 22 also constitutes a portionl of the nozzle head, but it extendsbelow the outlet of duct 10, and has a lateral outlet port 23.

It will be observed that the ducts 10 and 22 extend through a iitting25,which is preferably Y shaped, and threaded upon a relatively large duct26, slidingly connected with a tubular extension 27 carried by the rearhead ofthe burner cylinder 3. Air from the exterior is admitted to theduct 26 through the passages 30 and 31 in the obliquely extending arm ofthe fitting 25, whereby the air current delivered through the passage 30tends to gyrate in the duct 26 and at thenozzle outlet. The duct 2G maybe pushed into the burner cylinder 3 to reduce air heating capacity ofthe coils 2, and retracted to increase it.

lt will, of course, be understood that the air blast delivered throughthe pipe or duct .1.0 will exert an aspirating effect at the outlet 23of the fuel duct 22 in thenozzie head, thereby splitting up the fuelvapor, and a'toniizing unvaporized fuel, if any.

(living to the fact that the air delivered through the pipe 1. cornesfrom a source of supply under pressure, `(the liquid fuel being alsopreferably delivered, under pressure, through the pipe 1li) the mixturewill be delivered from the mixing duct 26 to the burner, withconsiderable velocity, acceler-` ated to sorne extent by burner suctionwhen the mixture is ignited at the burner outlet. Therefore, alargevolume of additional. air will be drawninto the burner through theapertures 4i, and. by proper regulation, through adjustment of thevalves at 5% and 241i, perfect combustion with a blue 'Haine may beobtained at the burner outlet.

It will be observed that in the structure as above described, the tubeor cylinder 15 conyof the fuel, and to aless extent upon the velocity ofvthe air. All of these factors should betalen into considerationu'ithreference to the density of the hydrocarbon, although a `Wide rangeof variation in proportion may exist, owing te the fact that both theair and fuel are heated very rapidly in the mixing tube 26, and in theburner 8, and also Aowing to the fact that the valves at 8 and 9A allowthe velocity of both the fuel and the air to be readily controlled byvalve adjustment.

In the construction illustrated, the air in pipe 7 may be heated toabout 800O F. The temperature of the fuel at the outlet of chamber l5will then be about 8600 F. under ordinary operating conditions, and Withproper valve adjustments and manual adjustment of duct 26.

The fuel should be heated in the tube l5 to an extent sniiic-ient tovaporize all of it, or substantially all of it, Without raising thetemperature very far beyond the vaporizing pointa and Vwith theconstruction herein disclosed, it is possible to control thistemperature with reasonable accuracy, and by excluding air from thevaporizing chamber, ca-rbonization and the clogging of the ducts orpassages may be effectually prevented.

ldlhile in the foregoing description of our invention we have referredto the various elements entering into the construction of our improvedburner, as pipes and cylinders, elbows and fittings, we Wish itunderstood that these terms are Words of description, and not oflimitation, it not being our intention to limit the scope of ourinvention to a structure which is built up from pipe elements, common inthe art, as distinguished from a structure in Which the various ductsand passages are incorporated in a :single body of metal, such, forexample, as a casting.

`We have alsodescribed the duct l, heating coil 2, and pipe 7, with itsassociated connections to the nozzle, as used for conveying` air underpressure to the nozzle. le Wish it understood that these pipeconnections may be used to convey steam to the nozzle, in which case thesteam Will, of course, be superheated in the coils 2. In the construetion slioivn, the steam Will be substantially a full equivalent, since aplentiful air supply is provided through thel adjustable tube 2G, andthrough the apertures i. The air delivered through the tube QG issullicient to maintain combustion. even though the tube 26 is pushedinto the coil toward the burner outlet in such a. manner as to connpletely enclose the nozzle, as is the case when it is found necessary toreduce the heating capacity of the coil. Ignition takes place at theoutlet of the tube 26, regardless ol the position of the tube within thecylinder 3, except only that when the tube. 2G is retracted to exposethe nozzle head, no ignition Will take place substantiallyat the nmazleoutlet.

lille claim :M

l. An oil burner, including the combina tion of a suction air tube, openat both ends, a compressed air tube leading from a source of air supplyunder pressure and provided with an outlet at one end of the suction airtube, a fuel supply tube leading through the suction air tube along thecompressed air tube and provided with a jet aperture for delivery offuel into the path of the conipressed air, an open ended burner tube.surrounding the outlet ends of the other tubes. and means for utilizing`the heat ot the burner to directly pre-heat the compressed air and toindirectly pre-hcat the fuel through the medium of thc heated air.

2. An oil burner`r including the combination of a suction air tube, openat both ends, a compressed air tube leading from a source of air supplyunder pressure and provided With an outlet at one end of the suction airtube, a fuel supply tube leading through the suction air tube along thecompressed air tube and provided with a jet aperture for delivery offuel into the )ath of the compressed air, an open ended lburner tubesurrounding the outlet ends of the other tubes, and means for utilizingthe heat o i' the burner to directly pre-heat the compressed air and toindirectly pre-heat the fuel through the medium of the heated air, saidcompressed air duct havingl a coil 1within the burner tube and anexterior portion substantially parallel to the burner tube and jacketedby a jimrtion ol' the suppl)` tube.

3. An oil burner, including the combination of fuel and air supply ductshavingr their outlet end portions enclosed by an open ended air suctionduct and enclosed in turn by an open ended combustion chamber, said airsupply duct including a coil Within the burner, and said fuel supplyduct having a portion in jacket relation to the air supply duct betweenthe burner and the air supply and fuel duct outlets, said jacketingportion of the fuel suppl)Y duct havingr an inlet at one end and anoutlet at the. other end to cause the fuel to travel longitinlinallv ofthe jacket along` the air supply duct.

d. An oil. burner, including the combina-- llt) j tion of fuel and airsupply ducts having their outlet endV portions enclosed by" an openended air suction duct,` and enclosed inturn by an open ended combustionchambei' at its outlet portion,said air supply duct including a coilWithin the burner, and said supply duet having an inlet at one endand ian outlet at the other, to cause the fuel to travel longitudinally olfthe jacket alongthe air supply duct, and valves for both the fuel andail" supply duets, betweei'l said jacket and the duct outlets. i

5. ln a burner, the combim'ttion with ail' and fuel supply' ducts havingoutlets an l ranged for mingling the fuel and air asv slidably supportedfrom said air suction duct, means Within saidconibustion cham- ,ber forpreheating the an to be used 1n the burner, and air connections for saidpreheating means adapted to permitthe sliding adjustment of saidcombustion chamber.

` In testimony whereof We atlix our signa# tures inthe presence of twoWitnesses. j it PETER W. TRIMBORN.

FRANK J. BLUM. Witnesses Lnvnlm'm C. Vlmmfnn, O. C. WEBER.

